Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) Paradoxical retraction of the lower intercostal spaces on inspiration (arrows) in a 72-year-old man with chronic obstructive pulmonary disease. (B) Lateral chest radiograph showing distention of the lungs associated with flattening of the diaphragm (arrows).
